A logic device for use with data signals having a continuously or semi-continuously varying waveform of substantially fixed frequency. Both the first code and the second code are reproduced on the article. When the wireless communication device executes a handoff to a second subnet, a mobility agent server notifies a virtual operator server of the handoff. A grounding plate assembly includes a drum contact member and a shaft contact member. The invention also features methods for producing human hemoglobin in these animals, human hemoglobins produced by these methods, and methods of using these animals to identify therapeutic substances. Such compositions may also include at least one active pharmaceutical ingredient andor at least one water repellant.